MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 5f022a207e0c1dd2686b5d72c46ea068977477361fb54123e038ef9812590ed7. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.

Database Entry


SilentBuilder


Vendor detections: 12


Maldoc score: 3


Intelligence 12 IOCs YARA 3 File information Comments 1
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 5f022a207e0c1dd2686b5d72c46ea068977477361fb54123e038ef9812590ed7
SHA3-384 hash: 06767cd3ad7b4345febe476eacea3d85b5c7fa3f160335d129e695a8713b9b34a740dac9adb7a1e8fa19ede03d18198e
SHA1 hash: 5d58cf56ece66e2d970094e473e75c0d28f5e62b
MD5 hash: 3cb5cbcea074b53166f814d8f08d431b
humanhash: vegan-foxtrot-jig-eleven
File name:3cb5cbcea074b53166f814d8f08d431b
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:115'712 bytes
First seen:2022-01-11 11:13:06 UTC
Last seen:2022-01-11 12:36:06 UTC
File type:Excel file xlsx
MIME type:application/vnd.ms-excel
ssdeep 3072:yKpb8rGYrMPe3q7Q0XV5xtezEsi8/dgQCyVEdBU6hubsll6UQjvxK:yKpb8rGYrMPe3q7Q0XV5xtuEsi8/dgbX
TLSH T12BB3CF9AB21E886DEA658B3058D7439A7727EC314F6F43872615B3227FBC8D04B1350B
Reporter zbetcheckin
Tags:excel SilentBuilder xlsx

Office OLE Information

This malware samples appears to be an Office document. The following table provides more information about this document using oletools and oledump.

OLE id
Maldoc score: 3
OLE dump

MalwareBazaar was able to identify 3 sections in this file using oledump:

Section IDSection sizeSection name
14096 bytesDocumentSummaryInformation
24096 bytesSummaryInformation
3105003 bytesWorkbook
OLE vba

MalwareBazaar was able to extract and deobfuscate VBA script(s) the following information from OLE objects embedded in this file using olevba:

TypeKeywordDescription
AutoExecAuto_OpenRuns when the Excel Workbook is opened
SuspiciousXLM macroXLM macro found. It may contain malicious code

Intelligence

File Origin
# of uploads :
2
# of downloads :
123
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
3cb5cbcea074b53166f814d8f08d431b
Verdict:
Malicious activity
Analysis date:
2022-01-11 11:19:25 UTC
Tags:
macros loader
Link:
https://app.any.run/tasks/96e5e490-ecc0-48f5-9854-142afff6e02f

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
File type:
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Has a screenshot:
False
Contains macros:
False
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/218183/
Detection(s):
TwinWave.EvilDoc.DOCXSTRGOOD.AOEX4.BITSNEEDEDFOR.RUNDLL32.EXE.200327.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.DOCXSTRGOOD.AOEX4.BITSNEEDEDFOR.BITSADMIN.EXE.200327.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.DOCXSTRGOOD.AOEX4.BITSNEEDEDFOR.URLDOWNLOADTOFILE.200415.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.DOCXSTRGOOD.AOEX4.BITSNEEDEDFOR.RUNDLL32.EXE.200416.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.Excel4Macro.HiddenSheetDLWAKEUP.20200310.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.Excel4DragoTrainingMontage.20210204.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.XL4MStringFractures.20210921.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.XLSLOLBINHammerToFall.20201218.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.XL4QakyFeaturingNothingNowhere.M2.20210611.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.XL4DataopItWasGoodLivingWithYou.20211109.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.DataOpGodGaveRockNRoll2U.20211215.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
DNS request
Creating a window
Сreating synchronization primitives
Creating a file
Creating a process with a hidden window
Launching a process
Moving a recently created file
Sending an HTTP GET request
Launching a process by exploiting the app vulnerability
Result
Verdict:
Malicious
File Type:
Legacy Excel File
Link:
https://app.docguard.net/5f022a207e0c1dd2686b5d72c46ea068977477361fb54123e038ef9812590ed7/results/dashboard
Payload URLs
URL
File name
http://gaidov.bg/wp-includes/Ug/
WorkBook
Document image
Image:
Download PNG
Document image
Verdict:
Malicious
Threat level:
  10/10
Confidence:
75%
Tags:
excel.exe macros macros-on-open print.exe rundll32 stripped
Link:
https://www.filescan.io/uploads/61dd667f1c0d769df9e2226e/reports/304305a9-53ea-41f0-9449-4eaa7088cca5/overview
Result
Verdict:
MALICIOUS
Link:
https://labs.inquest.net/dfi/sha256/5f022a207e0c1dd2686b5d72c46ea068977477361fb54123e038ef9812590ed7
Details
Autostarting Excel Macro Sheet
Excel contains Macrosheet logic that will trigger automatically upon document open.
Result
Threat name:
Hidden Macro 4.0 Emotet
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/918279
Signature
C2 URLs / IPs found in malware configuration
Document contains OLE streams with names of living off the land binaries
Document exploit detected (creates forbidden files)
Document exploit detected (drops PE files)
Document exploit detected (process start blacklist hit)
Document exploit detected (UrlDownloadToFile)
Drops PE files to the user root directory
Found Excel 4.0 Macro with suspicious formulas
Found malicious Excel 4.0 Macro
Found malware configuration
Hides that the sample has been downloaded from the Internet (zone.identifier)
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for submitted file
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Office process drops PE file
Sigma detected: Microsoft Office Product Spawning Windows Shell
System process connects to network (likely due to code injection or exploit)
Yara detected Emotet
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 550758 Sample: GUt7HHQm2q Startdate: 11/01/2022 Architecture: WINDOWS Score: 100 46 162.214.50.39 UNIFIEDLAYER-AS-1US United States 2->46 48 203.114.109.124 TOT-LLI-AS-APTOTPublicCompanyLimitedTH Thailand 2->48 50 34 other IPs or domains 2->50 56 Multi AV Scanner detection for domain / URL 2->56 58 Found malware configuration 2->58 60 Multi AV Scanner detection for submitted file 2->60 62 11 other signatures 2->62 12 EXCEL.EXE 7 18 2->12         started        17 svchost.exe 2->17         started        signatures3 process4 dnsIp5 52 gaidov.bg 78.128.43.182, 49165, 80 TELEPOINTBG Bulgaria 12->52 38 C:\Users\user\sun.ocx, PE32 12->38 dropped 40 C:\Users\user\...\Cz3ILXZKsyxJ0RF[1].dll, PE32 12->40 dropped 42 C:\Users\user\DesktopbehaviorgraphUt7HHQm2q.xls, Composite 12->42 dropped 68 Document exploit detected (creates forbidden files) 12->68 70 Document exploit detected (UrlDownloadToFile) 12->70 19 rundll32.exe 12->19         started        file6 signatures7 process8 process9 21 rundll32.exe 2 19->21         started        file10 36 C:\Windows\SysWOW64\Fweyvh\zsym.xex (copy), PE32 21->36 dropped 64 Hides that the sample has been downloaded from the Internet (zone.identifier) 21->64 25 rundll32.exe 21->25         started        signatures11 process12 process13 27 rundll32.exe 1 25->27         started        signatures14 66 Hides that the sample has been downloaded from the Internet (zone.identifier) 27->66 30 rundll32.exe 27->30         started        process15 process16 32 rundll32.exe 2 30->32         started        dnsIp17 44 131.100.24.231, 49166, 80 GOPLEXTELECOMUNICACOESEINTERNETLTDA-MEBR Brazil 32->44 54 System process connects to network (likely due to code injection or exploit) 32->54 signatures18
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/5f022a207e0c1dd2686b5d72c46ea068977477361fb54123e038ef9812590ed7/
Threat name:
Document-Excel.Downloader.EncDoc
Create hunting rule
Status:
Malicious
First seen:
2022-01-11 11:14:08 UTC
File Type:
Document
Extracted files:
8
AV detection:
11 of 27 (40.74%)
Threat level:
  3/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=l4bcuid6bqo5e2dllvzmi3vanclxi5zwd62uci7ahdxzqeszb3lq._file
Result
Malware family:
emotet
Create hunting rule
Score:
  10/10
Tags:
family:emotet banker macro suricata trojan xlm
Link:
https://tria.ge/reports/220111-nbz4zsffcj/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Modifies registry class
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Drops file in System32 directory
Loads dropped DLL
Blocklisted process makes network request
Downloads MZ/PE file
Emotet
Process spawned unexpected child process
suricata: ET MALWARE W32/Emotet CnC Beacon 3
Malware Config
Dropper Extraction:
http://gaidov.bg/wp-includes/Ug/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/5f022a207e0c1dd2686b5d72c46ea068977477361fb54123e038ef9812590ed7

YARA Signatures

MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.

Rule name:Excel_Hidden_Macro_Sheet
Create hunting rule
Rule name:Qbot
Create hunting rule
Author:Dhanunjaya
Description:Yara Rule to Detect Qbot
Rule name:SUSP_Excel4Macro_AutoOpen
Create hunting rule
Author:John Lambert @JohnLaTwC
Description:Detects Excel4 macro use with auto open / close

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Web download

SilentBuilder

Excel file xlsx 5f022a207e0c1dd2686b5d72c46ea068977477361fb54123e038ef9812590ed7

(this sample)

  
Delivery method
Distributed via web download
  
URLhaus
https://urlhaus.abuse.ch/url/1964933/
Cape
Cape
https://www.capesandbox.com/analysis/218183/

Comments


Avatar
zbet commented on 2022-01-11 11:13:10 UTC

url : hxxp://www.startcode.co.il/wp-content/LicFtjh0e/?i=1